scholarly journals The effect of ovulatory follicle size at the time of insemination onpregnancy rate in lactating dairy cows

2016 ◽  
Vol 40 ◽  
pp. 68-74 ◽  
Author(s):  
Abdulkadir KESKİN ◽  
Gülnaz MECİTOĞLU ◽  
Ebru BİLEN ◽  
Barış GÜNER ◽  
Abdulkadir ORMAN ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Lactating Dairy Cows ◽  
Ovulatory Follicle ◽  
Follicle Size

Effects of Beta-carotene Administration on Fertility in Lactating Dairy Cows

2021 ◽  
Author(s):  
Ebru Karakaya Bilen ◽  
Gülnaz Yılmazbaş Mecitoglu
Keyword(s):  
Dairy Cows ◽  
Detection Rate ◽  
Beta Carotene ◽  
Prostaglandin F2 Alpha ◽  
Lactating Dairy Cows ◽  
Follicle Diameter ◽  
Ovulatory Follicle ◽  
Estrus Detection ◽  
Potential Benefits ◽  
Β Carotene

Background: Beta-(β-) carotene, is the precursor to vitamin A, in particular, has some potential benefits on reproduction. The main objective of this study was to investigate the efficacy of β-carotene administration on fertility following either prostaglandin F2 alpha (PGF) induced estrus or Ovsynch protocol in lactating dairy cows.Methods: Cows with at 47±3 postpartum days were divided into two groups: β-carotene group (βC, n=139) was treated with injectable β-carotene while untreated cows served as control (CON, n=227). In both groups, PGF was administered and heatmount detectors were applied at 54±3 days postpartum. Cows detected in estrus after PGF were inseminated. Cows that had not been detected in estrus were divided into two groups 7 days after PGF administration; βC-OVS (n=137) and CON-OVS (n=89). Ovsynch protocol was initiated 4 days after β-carotene administration.Result: The estrus detection rate was similar between the βC and CON groups (P = 0.19). Pregnancy per AI (P/AI) on d 31 was also similar between groups (P = 0.93). In the Ovsynch protocol, ovulation to the first GnRH and ovulatory follicle diameter at the time of insemination did not differ between groups. No difference was observed in P/AI at d 31 (P = 0.13). The results of this study indicated that β-carotene administration had no effect on fertility either PGF induced estrus or Ovsynch protocol in dairy cows. 

330 Effect of inducing high or low progesterone concentrations during ovulatory follicle development on double ovulation and fertility of lactating dairy cows

2016 ◽  
Vol 94 (suppl_2) ◽  
pp. 155-155
Author(s):  
J. P. N. Martins ◽  
D. Wang ◽  
N. Mu ◽  
A. P. Martini ◽  
G. F. Rossi ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Follicle Development ◽  
Lactating Dairy Cows ◽  
Ovulatory Follicle

scholarly journals Level of circulating concentrations of progesterone during ovulatory follicle development affects timing of pregnancy loss in lactating dairy cows

2018 ◽  
Vol 101 (11) ◽  
pp. 10505-10525 ◽  
Author(s):  
J.P.N. Martins ◽  
D. Wang ◽  
N. Mu ◽  
G.F. Rossi ◽  
A.P. Martini ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Pregnancy Loss ◽  
Follicle Development ◽  
Lactating Dairy Cows ◽  
Ovulatory Follicle

Follicular dynamics, corpus luteum growth and regression in lactating dairy cattle

1991 ◽  
Vol 71 (1) ◽  
pp. 61-68 ◽  
Author(s):  
C. Taylor ◽  
R. Rajamahendran
Keyword(s):  
Dairy Cows ◽  
Corpus Luteum ◽  
Estrous Cycle ◽  
Follicular Growth ◽  
Dominant Follicle ◽  
Lactating Dairy Cows ◽  
Ovulatory Follicle ◽  
Second Wave ◽  
Lactating Dairy Cattle ◽  
Follicular Dynamics

Ultrasound imaging and progesterone (P4) profiles were used to characterize follicular and corpus luteum (CL) growth and regression in 10 cycling dairy cows. Thirteen of sixteen cycles were characterized by two waves of follicular growth, the second wave giving rise to the ovulatory follicle. The remaining three cycles had three waves. There was no difference between two- and three-wave cycles with regard to the day of emergence of the first or second dominant follicle (day 2.5 ± 0.9 vs. day 2.4 ± 1.2 and day 12.4 ± 1.6 vs. day 12.0 ± 2.0, respectively) or the onset of regression of the first dominant follicle (day 12.5 ± 1.5 vs. day 12.3 ± 1.5). In two wave cycles, estrous cycle length was shorter (20.8 ± 1.7 d vs. 29.7 ± 4.9 d), the first day of decline in P4 (day 16.2 ± 1.5 vs. day 23.7 ± 5.5) and the onset of CL regression (day 17.1 ± 1.3 vs. day 24.3 ± 5.5) was earlier. It is concluded that two waves of follicular growth in an estrous cycle is the norm in lactating dairy cows. The presence of an additional wave is due to a prolonged luteal phase. Key words: Follicle, corpus luteum, estrous cycle, dairy cow

Impact of circulating concentrations of progesterone and antral age of the ovulatory follicle on fertility of high-producing lactating dairy cows

2012 ◽  
Vol 24 (1) ◽  
pp. 267 ◽  
Author(s):  
J. Richard Pursley ◽  
Joäo Paulo N. Martins
Keyword(s):  
Dairy Cows ◽  
Dairy Cow ◽  
Gonadotropin Releasing Hormone ◽  
Oestrous Cycle ◽  
Dairy Production ◽  
Management Issue ◽  
Lactating Dairy Cows ◽  
Ovulatory Follicle ◽  
The World ◽  
Conception Rates

Dairy cow infertility negatively affects profit of dairy production enterprises around the world, and enhancing conception rates of dairy cows is a critical management issue to resolve. It appears that conception rates of dairy cows are attenuated due to reduced progesterone concentrations in circulation during growth of the ovulatory follicle. It is not clear how reduced progesterone influences fertility, but data presented in this brief review suggest that it can be somewhat reversed through increasing concentrations of progesterone during the growth of the ovulatory follicle before luteolysis. Ovsynch protocols may be utilised to enhance progesterone concentrations through the induction of an accessory corpus luteum (CL) following the initial gonadotropin-releasing hormone (GnRH) treatment. Cows at Day 13 of the oestrous cycle with a 7-day-old accessory CL had ~50% more progesterone at the time of prostaglandin injection of Ovsynch compared with cows with only a Day 13 CL. Ovsynch can consistently induce an accessory CL following the initial GnRH treatment if cows are on Days 6 or 7 of the oestrous cycle at the time of treatment. Pre-synchrony strategies are critical to enhance the probability that cows will be on Days 6 or 7 at first GnRH treatement of Ovsynch.

scholarly journals Period of dominance of the ovulatory follicle influences embryo quality in lactating dairy cows

Reproduction ◽  
2009 ◽  
Vol 137 (5) ◽  
pp. 813-823 ◽  
Author(s):  
Ronaldo L A Cerri ◽  
Heloísa M Rutigliano ◽  
Ricardo C Chebel ◽  
José E P Santos
Keyword(s):  
Dairy Cows ◽  
Artificial Insemination ◽  
Embryo Quality ◽  
Lower Proportion ◽  
Oestrous Cycle ◽  
The Other ◽  
Lactating Cows ◽  
Lactating Dairy Cows ◽  
Ovulatory Follicle ◽  
Timed Artificial Insemination

Length of dominance of the ovulatory follicle and exposure to oestradiol (OE2) during proestrus can affect fertility. Lactating cows had their oestrous cycle pre-synchronized and were subjected to one of the four synchronization treatments. Cows in the oestrus detection (OD) treatment received GnRH on day 6 of the oestrous cycle, PGF2α7 days later, and were inseminated at detected oestrus. The remaining cows were subjected to the Ovsynch (OVS) protocol (day 0 GnRH, day 7 PGF2α, day 9 GnRH, and timed artificial insemination (AI) 12 h later) starting on day 3 (OVS3) or day 6 (OVS6 and OVS6E) of the oestrous cycle. Cows in the OVS6E treatment received an injection of 0.5 mg oestradiol cypionate 36 h before AI. Ovaries were examined by ultrasonography and blood was sampled for progesterone and OE2concentrations. Uteri were flushed 6 days after AI and recovered embryos–oocytes evaluated. Diameter of the ovulatory follicle at AI differed (P<0.01) among treatments, and it was the largest for OVS3 cows, which also had extended (P<0.01) length of follicular dominance. During proestrus, OD and OVS6E cows had increased (P<0.01) OE2concentrations. Fertilization was not altered by treatments, and maximum fertilization was achieved when the number of accessory spermatozoa was >7. Proportions of viable embryos in relation to embryos and embryos–oocytes recovered were smaller for OVS3 cows (P<0.01) than the other treatments, and embryos from OVS3 cows also had fewer (P<0.01) blastomeres and tended (P=0.09) to have a lower proportion of live blastomeres. Extending the period of follicle dominance did not alter fertilization but reduced (P<0.001) embryo quality. Embryo quality was compromised even when the dominance of the ovulatory follicle was extended by only 1.5 days.

13 Evaluation of PG-3-G presynchronization in Ovsynch-P programs in lactating dairy cows: Preliminary results

2019 ◽  
Vol 31 (1) ◽  
pp. 132
Author(s):  
G. S. Velho ◽  
C. R. Oliveira ◽  
C. G. B. Berlitz ◽  
D. S. V. Luiz ◽  
M. F. C. Chaiben ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Body Condition Score ◽  
Pearson Correlation ◽  
Chi Square ◽  
Lactating Dairy Cows ◽  
Ovulatory Follicle ◽  
Condition Score ◽  
Correlation Tests ◽  
The Mean ◽  
Intensive System

Presynchronization treatments associated with the Ovsynch protocol and its modifications have been used to improve reproductive performance in lactating dairy cows. Use of a PG-3-G protocol is indicated to increase the number of cows in the most ideal stage of the oestrous cycle (Days 5-9) at first gonadotropin-releasing hormone (GnRH) injection of the Ovsynch protocol. The objective of this study was to compare fertility of lactating dairy cows submitted to Ovsynch-P, preceded by PG-3-G protocol or not. A total of 86 Holstein cows [body condition score of 2.6±0.2 (1-to-5 scale), 3 and 10 years old, mean milk yield of 28.1±7.9kg per day, and 118±56 days postpartum period] maintained in a semi-intensive system were blocked by parity and date of calving and randomly assigned to groups: control (n=44) and PG-3-G (n=42). On Day -10 cows in the PG-3-G group received an injection of 500µg of sodium cloprostenol IM (Estron, Agener União, Brazil), and on Day -7 they received 0.05mg of Lecirelin IM (GnRH, Gestran, Agener União). On Day 0, all cows had the first dose of Ovsynch GnRH injection and a 1-g progesterone intravaginal implant (P4, Primer, Agener União). On Day 7, a dose of sodium cloprostenol was administered to induce corpus luteum (CL) luteolysis, and the P4 implant was removed. Forty-eight hours later, cows were injected with the second dose of GnRH and inseminated 12 to 18h later. The presence of CL and ovulatory follicle (OF) diameter were determined by transrectal ultrasonography (Aquila, Pie Medical, Maastricht, the Netherlands) on Days 0, 7, and 9, and gestation diagnosis was done on Day 30 after AI. Statistical analysis was performed using ANOVA, chi-square, Mann-Whitney, and Pearson correlation tests in SPSS 18 (Armonk, NY, USA), considering P=0.05 significant and a tendency when P&gt;0.05 but P=0.10. Incidence of CL on Day 0 tended to be more frequent (P=0.1) in the PG-3-G group (78.6%) compared with the control (59%), but CL presence on Day 7 did not differ (P=0.98) between the groups (35 and 34%, respectively). Based on the odds ratio, PG-3-G cows were 2.16 times more likely to have a CL on Day 0. The mean diameter of OF on Day 9 was smaller (P&lt;0.05) in PG-3-G cows (12.6mm) than in control cows (15.3mm), and a negative correlation was detected (r=−0.29) between the presence of CL on Day 0 and the diameter of OF on Day 9 (P=0.05). Pregnancies per AI tended (P=0.08) to be higher in PG-3-G cows (52%) than in control cows (34%). In summary, cows submitted to presynchronization with the PG-3-G protocol presented higher frequency of CL on Day 0 and tended to have a higher pregnancies per AI compared with control cows.

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